fix: 添加超时报错，修复一个错误的测试

tests/test_backdoor_detection.py

@@ -1,6 +1,8 @@
 import unittest
 import warnings
 
+from pydantic import NoneStr
+
 from detection.backdoor_detection import find_dangerous_functions
 from detection.GPTdetection import detectGPT
 import os
@@ -84,6 +86,8 @@ class TestBackdoorDetection(unittest.TestCase):
         self.assertEqual(len(results["low"]), 0)
 
     def test_gpt_env_no_set(self):
+        if os.getenv("OPENAI_API_KEY") is not None:
+            self.skipTest("OPENAI_API_KEY is setted")
         content = "print('test test')"
         with self.assertRaises(ValueError):
             detectGPT(content)